The Effect of Winter Wheat and Spring Oats Cover Crops Termination Timing on Corn Yield
Applied Research
Wayne Flanary
Field Specialist in Agronomy
University of Missouri Extension
St. Joseph
Abstract
A cover crop termination study was established at the University of Missouri Graves Chapple Research Center located at Fairfax, Missouri. The trial objective was to measure the impact of termination timing of winter wheat and spring oats on corn yield. The cover crop treatments were tested using an experimental complete randomized block design with three replications. Corn was planted April 30, 2021, and 180 pounds of nitrogen in the form of urea coated with Agrotain top-dressed the same day. Cover crops were terminated at tiller, joint, boot and head flowering. All growth stages of the winter wheat occurred earlier than spring oats. Corn yield was reduced with each later termination timing in both spring oats and winter wheat with the largest yield losses occurring during the termination at the flowering stage. Termination timing of winter wheat and spring oats as cover crops with corn should be considered early.
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Authors: Wayne Flanary
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Flanary, W. Field Specialist in Agronomy, University of Missouri Extension, Missouri, 64507